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* denotes walnut twig beetle’s native range
Thousand cankers disease on our doorstep
Introduction
The Tennessee Department of Agriculture recently confirmed the presence of thousand cankers disease (TCD) in Knox County, Tennessee. This find in Tennessee marks the first time this disease has been confirmed east of the Mississippi River. This find also marks the first time TCD has been identified in the native range of black walnut, which is considered to be a preferred host for the walnut twig beetle. The walnut twig beetle vectors the pathogen that causes TCD. The discovery of TCD in Tennessee was made by a Tennessee Department of Agriculture Forester in July, 2010.
The walnut twig beetle (Pityophthorus juglandis) and its fungal associate (Geosmithia morbida - proposed) are not known to exist in North Carolina at this time.
Walnut Twig Beetle
The walnut twig beetle (Pityophthorus juglandis) is native to the southwestern United States and northern Mexico, but has recently been documented in walnut trees outside of its natural range. Prior to the recent find in Knox County, Tennessee, the beetle had previously been identified in association with walnut mortality in several western states including Arizona*, New Mexico*, California*, Utah, Colorado, Idaho, Oregon, and Washington. By itself, the beetle does not cause significant mortality, however, the beetle in combination with its associated fungus (Geosmithia morbida - proposed), causes the highly destructive TCD. The walnut twig beetle is in the same family as the southern pine beetle and ips engraver beetles, and like these beetles, it is very small; adults are roughly 1/20 of an inch long.
Thousand Cankers Disease
Thousand cankers disease is caused by a pathogen vectored by the walnut twig beetle and is caused by the fungus Geosmithia morbida (proposed). The pathogen generally kills the host tree within 2-3 years. When a beetle bores into the
Volume 10TCD-1
August 2010

* denotes walnut twig beetle’s native range
Thousand cankers disease on our doorstep
Introduction
The Tennessee Department of Agriculture recently confirmed the presence of thousand cankers disease (TCD) in Knox County, Tennessee. This find in Tennessee marks the first time this disease has been confirmed east of the Mississippi River. This find also marks the first time TCD has been identified in the native range of black walnut, which is considered to be a preferred host for the walnut twig beetle. The walnut twig beetle vectors the pathogen that causes TCD. The discovery of TCD in Tennessee was made by a Tennessee Department of Agriculture Forester in July, 2010.
The walnut twig beetle (Pityophthorus juglandis) and its fungal associate (Geosmithia morbida - proposed) are not known to exist in North Carolina at this time.
Walnut Twig Beetle
The walnut twig beetle (Pityophthorus juglandis) is native to the southwestern United States and northern Mexico, but has recently been documented in walnut trees outside of its natural range. Prior to the recent find in Knox County, Tennessee, the beetle had previously been identified in association with walnut mortality in several western states including Arizona*, New Mexico*, California*, Utah, Colorado, Idaho, Oregon, and Washington. By itself, the beetle does not cause significant mortality, however, the beetle in combination with its associated fungus (Geosmithia morbida - proposed), causes the highly destructive TCD. The walnut twig beetle is in the same family as the southern pine beetle and ips engraver beetles, and like these beetles, it is very small; adults are roughly 1/20 of an inch long.
Thousand Cankers Disease
Thousand cankers disease is caused by a pathogen vectored by the walnut twig beetle and is caused by the fungus Geosmithia morbida (proposed). The pathogen generally kills the host tree within 2-3 years. When a beetle bores into the
Volume 10TCD-1
August 2010